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Power spectral density collected at the output of the DUT. Intra-cavity beating at between its two main modes gives rise to two side-bands at 1550.2 and 1559.2 nm.
Optical spectrum measured at the SOA output. In the inset is depicted the modulation components at and .
Output of the SOA measured in the electrical domain depicting the intermediate frequency signal associated with the 371.1 GHz beat-tone from the mode-locked laser under investigation. In the inset is depicted the intermediate frequency of a 909.5 GHz beat-tone signal. Experimental measurements are shown in and Lorentzian fitting in continuous line.
Comparison of the different analyzed schemes for detecting THz-signals and THz beat-tones. Reported data for FROG and bolometer schemes are after Ref. 6, while UTC-PD is after Ref. 8.
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